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M6 x 25mm Full Thread Hexagon Bolts (DIN 933) - Black A2 Stainless Steel: Accu.co.uk: Precision Screws
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Hillman 5/16-in x 1-1/2-in Black Phosphate Coarse Thread Hex Bolt (6-Count) in the Hex Bolts department at Lowes.com
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